Messages in this thread | | | Date | Thu, 2 Oct 2008 21:01:17 -0700 | From | Arjan van de Ven <> | Subject | Re: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority |
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On Thu, 2 Oct 2008 13:24:57 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> Of course, that could all be wrong and we could be stuck somewhere > else. A good way to diagnose this stuff would be > > --- a/kernel/sched.c~a > +++ a/kernel/sched.c > @@ -5567,10 +5567,14 @@ EXPORT_SYMBOL(yield); > void __sched io_schedule(void) > { > struct rq *rq = &__raw_get_cpu_var(runqueues); > + unsigned long in, out; > > delayacct_blkio_start(); > atomic_inc(&rq->nr_iowait); > + in = jiffies; > schedule(); > + out = jiffies; > + WARN_ON(time_after(out, in + 1 * HZ)); > atomic_dec(&rq->nr_iowait); > delayacct_blkio_end(); > } > _ > > perhaps for varying values of "1".
I'll run with this. (well with a value of "1000" for 1 ;-)
Also I'll tell latencytop to give me the full backtrace as well ;-)
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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